ぼくの友達はタイワン(台湾)に行きましたから、しゃぶしゃぶのパーティーをしました。I can't understand why your friends gave shabushabu party.Taiwang is famous for shabushabu?I don't think going to Taiwang and having a shabushabu party have something to do with.you don't make any mistakes but タイワンに行って、しゃぶしゃぶパーティーをしました is more natural^^